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Smith is the only suspect in Parker’s disappearance, but he has not been charged.

A wrongful death lawsuit was filed by Parker’s estate in Orange County court last week claiming Smith is responsible for her death.

On Monday, Yvonne Stewart said she has one goal with her lawsuit again Smith: to have him start talking.

"Michelle is still missing," said Stewart. "I want answers, and this is how we're going to try and get them."

Stewart said earlier this year, Smith cut off her visitations with Parker's 4-year-old twins and that he's moved out-of-state. She claims that has nothing to do with the timing of her lawsuit.

"His family and Dale, they haven't been honest, and I want them to answer my questions under oath because I think they know," said Stewart.

Stewart said it is time to get answers.

"To have somebody do something to your daughter or son and not tell you, I am really surprised that I'm not put in a sanitarium, but you know what? I'm going to fight," said Stewart. "I'm mad, and Michelle deserves this, and our family deserves this, and her children deserve this."

John Morgan, who represents Parker’s family, said the suit is all about answers and accountability.

"This is really about accountability and people answering questions that really haven't been answered yet," Morgan said.

Morgan said he hopes through depositions and discovery involved in the civil suit they can ask questions the police could not. He said they plan to serve Smith and his parents with a subpoena soon and that even if Smth and his parents plead the Fifth Amendment, it will still get the case into a courtroom and before a jury.

Parker’s SUV was found abandoned, and a cellphone was recovered under an Orange County bridge.